BTA item/chunk ban fix

Packet.java

    public static CompoundTag readCompressedCompoundTag(final DataInputStream dis) throws IOException {
        final int length = Short.toUnsignedInt(dis.readShort());
        if (length == 0) {
            return null;
        }
        final byte[] data = new byte[length];
        dis.readFully(data);
        return NbtIo.readCompressed(new ByteArrayInputStream(data));
    }